3. Lesson 6.2:
*Another method for solving a system of linear equations is called
substitution.
**Steps for using SUBSTITUTION:
solve one equation for one variable (isolate 1 variable)
substitute the new equation into the other equation for the
isolated variable; then solve the equation
then substitute the value from step 2 into either equation and
solve for the other variable
write the solution as an ordered pair
[check the solution in both equations!]
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